Turn Betty Crocker® Gluten Free yellow cake mix into a delicious homemade carrot cake. Ingredients Directions 1 Heat oven to 350°F. Grease bottom only of 8- or 9-inch square pan with shortening, or spray with cooking spray. 2 In large bowl, beat cake mix, water, 1/2 cup butter, cinnamon, nutmeg, 2 teaspoons vanilla and eggs on low speed 30 seconds.